Sinclair ZX80 / ZX81 / Z88 Forums

Question what do you with with a zeddy that looks like this ?


some may say scrap it.... but me...


i see it as more of a re birth.... for a little project i have in mind

Andy

Keep those pictures coming!

a little more progress on the re-build
ula, cpu and rom socket in place... and a few other bits that are too big...


I'm tying to squeeze most of the passives on the back side using SMD ( if i have the correct values )


regards Andy

DO IT! Only the best people have smd passives on the back side

With the right size you can place them between the pins. I think these are 0805s.



But why would you want to remove obstructions from the top side? Careful. You know where this kind of tomfoolery ends up...



WHAT ARE YOU DOING MAN! STOP IT! THINK OF THE CHILDREN!

more work on the board today, most of the top side done.

The Bottom side, mix of through hole and smd.

bit of a hodge podge of diodes

bodge on a nearly empty RF can, you might notice no ear / mic circuit yet !
or memory

and after a little debugging and poking around with a scope i found 2 shorts,
one that i should have definitely spotted had i have looked properly, the other
a tiny solder splash across 2 adjacent tracks.

i just need to add some ram... now then how do you fit an SMD ram chip into
an 81... oh yeah i remember now....


Regards Andy

YES! That's what I'm talkin' about

sirmorris wrote: ↑Sun Sep 10, 2017 11:48 pm YES! That's what I'm talkin' about

Calm down lad, you're blow the top off your chip!

Mark

You could solder the SMD RAM directly to the underside of the zeddy

This is starting to look really interesting. Give us MORE!

I take my hat off to you Andy and your vision for that poorly zeddy brought back to life is memorising.
Is that a re-designed ula on that atmega chip I see.
Well done Andy well done